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There are a lot of bugs related to project import. From them it's obvious they are caused by numerous race conditions (the winsys GUI components are not made thread safe enough (just partially, what is wrong, anyway I prefer to make them not thread safe the way typical Swing components are)). It needs to be achieved the components are accessed from AWT thread only, the way normal Swing components needs to be. See the issues (#24862, #24864, #24589 etc.).
Target milestone was changed from '3.4' to TBD.
Because Window System v1 will not be supported from now by our team, all old winsys issues (now "core/window system v1" issues) are going to be closed as WONTFIX. Changes in API which emerged both from UI spec and problems with adjusting to the older API are described in the document http://core.netbeans.org/windowsystem/changes.html. It shows also recommends how the client code should be adjusted to the new window system. If you think this issue apply also to the new winsys then change the subcomponent (to "core/window system") and REOPEN it.
issue doesn't apply to new window system - verified